(Heavy Magnesia.)

A white, dense, and very fine powder, which should conform to the reactions and tests for magnesia, from which it diners in not readily uniting with water to form a gelatinous hydrate.

Official Preparation

Pulvis Rhei Compositum - Pulveris Rhei Compoisiti - Compound Powder of Rhubarb. - Formula: Rhubarb, 25; magnesia, 65; ginger, 10 parts.

Dose. - As a laxative, 20-60 grains (1.3-4.0 Gm.) [30 grains (2 Gm.), U. S. P.].